40386820 has 24 divisors (see below), whose sum is σ = 84936600. Its totient is φ = 16131072.

The previous prime is 40386817. The next prime is 40386833. The reversal of 40386820 is 2868304.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 3444736 + 36942084 = 1856^2 + 6078^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20436 + ... + 22324.

It is an arithmetic number, because the mean of its divisors is an integer number (3539025).

Almost surely, 2^40386820 is an apocalyptic number.

It is an amenable number.

40386820 is an abundant number, since it is smaller than the sum of its proper divisors (44549780).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

40386820 is a wasteful number, since it uses less digits than its factorization.

40386820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2967 (or 2965 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 31.

The square root of 40386820 is about 6355.0625488661. The cubic root of 40386820 is about 343.0940761423.

The spelling of 40386820 in words is "forty million, three hundred eighty-six thousand, eight hundred twenty".